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CBSE Questions for Class 10 Chemistry Periodic Classification Of Elements Quiz 5 - MCQExams.com
CBSE
Class 10 Chemistry
Periodic Classification Of Elements
Quiz 5
Which of the following pair of elements do not resemble according to Newlands' arrangement?
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Lithium and sodium
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Beryllium and magnesium
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Boron and silicon
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Oxygen and selenium
Explanation
Boron and silicon do not lie in the same group so they do not resemble or have similar properties according to Newlands' arrangement.
Hence, correct option is $$\text{C}$$.
Find the sum of period number and group number of phosphorous?
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$$16$$
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$$17$$
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$$18$$
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$$19$$
Explanation
The period number of phosphorous is $$3$$ and group number is $$15$$, so, the sum is $$18$$.
Newlands assumed that only ______________ elements existed in nature.
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108
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48
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32
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56
Explanation
Newlands had assumed that only 56 elements existed in nature and that no more elements were to be discovered. Later, several new elements were discovered.
Hydrogen resembles :
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alkali metals
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halogens
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both A and B
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noble gases
Explanation
Hydrogen resembles alkali metals because it has only one electron in the outermost shell same as alkali metals. It can donate one electron to become $$H^+$$.
It resembles halogens because it needs one electron to completely fill its valence shell to attain noble gas configuration. It also forms diatomic molecule, combines with metals and non-metals to form compounds.
State true or false.
Position of isotopes was clearly defined in Mendeleev's periodic table.
Position of lanthanides and actinides was clearly defined in Mendeleev's periodic table.
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True, True
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True, False
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False, True
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False, False
Explanation
Since Mendeleev's classification is based on atomic weights, the position of isotopes was not given. Lanthanides and Actinides were not known at that time. Their position has not been defined in the periodic table.
Hence, both statements are false.
Which of the following sets of atomic masses do not correspond to Dobernier traid?
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$$7, 23, 39$$
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$$20, 38, 56$$
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$$47, 91, 178$$
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$$54, 95, 183$$
Explanation
The following sets of atomic masses do not correspond to Dobernier traid.
(C) $$\displaystyle 47, 91, 178$$
(D) $$\displaystyle 54, 95, 183$$
In these sets, the atomic mass of middle element is not equal to the mean of atomic masses of first and last element.
$$\displaystyle 91 \neq \dfrac {47+178}{2}$$
$$\displaystyle 95 \neq \dfrac {54+183}{2} $$
The correct order of atomic size of $$Na, Be$$ and $$Mg$$ is:
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$$Be > Mg > Na$$
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$$Na > Mg > Be$$
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$$Mg > Na > Be$$
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$$Na = Mg > Be$$
Explanation
As we move down the group, the atomic size increases.
$$\therefore Mg>Be$$. And along the period, the atomic size decreases towards the right, hence $$Na>Mg$$.
Thus final order is $$Na>Mg>Be$$.
After the classification of elements study of elements become____________.
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difficult
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easy
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both A and B
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None of these
Explanation
After the classification of elements study of elements become $$\text{easy}$$.
Classification of elements helps us to approach a systematic study of various elements found in nature without which it would be really difficult to study the properties of elements in a streamlined manner.
Which of the following is a defect in the Mendeleev's periodic table?
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Prediction of new elements
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Doubtful atomic weights
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Anomalous position of hydrogen
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Non-systematic study of elements
Explanation
The position of hydrogen was not right in the Mendeleev's periodic table. It was placed in $$I A$$. However, it resembles the elements of both $$IA$$(alkali metals) and group $$VII A$$ (halogens).
The position of hydrogen in the periodic table is not fixed but is anomalous.
Prediction of new elements, doubtful atomic weights, and non-systematic study of elements is the significance of Mendeleev's periodic table.
The correct option is $$C$$.
In the periodic table, the elements having greater non-metallic character are placed at which corner of the periodic table?
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Upper left
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Center
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Lower right
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Lower left
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Upper right
Explanation
As shown in the image, metals occupy the left three-fourth of the periodic table, while non-metals except hydrogen are placed at the upper right corner of the periodic table.
The elements with the properties of both metals and non-metals are called metalloids(semi-metals).
Classification of elements makes the study of physical and chemical properties of elements ________ and __________.
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slow, difficult
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simple, organised
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Complicated, unorganized
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none of these
Explanation
Periodic classification of elements is the method by which elements are grouped on the basis of their characteristics. Classification of elements makes the study of physical and chemical properties of elements simple and organised.
John Newlands arranged the known elements in a/an ______ order of their atomic _______ .
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increasing, masses
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decreasing, masses
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increasing, numbers
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decreasing, numbers
Explanation
John Newlands arranged the known elements in increasing order of their atomic masses. He started with the element having the lowest atomic mass ( hydrogen) and ended at thorium which was the $$56^{th}$$ element. He found that every eighth element had properties similar to the first. Some of the elements satisfying this order are arranged as $$H, Li, Be, B, C, N, O$$.
Dobereiner was the first person to illustrate the relationship between the ____________ of elements and their properties.
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atomic masses
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electron negativity
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molecular masses
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number of protons
Explanation
Dobereiner grouped elements in sets of triads. Each group had 3 elements. He illustrated the relationship between the atomic masses of elements and their properties with his law of triads.
Which one of the following is an example of Dobereiner's triad?
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$$Li , Al , Ca$$
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$$Li , Na , K$$
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$$Li , K , Na$$
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$$K , Al , Ca$$
Explanation
$$Li, Na, K$$ is the example of Dobereineer's triad. Here, the average atomic weights of $$Li$$ and $$K$$ equal the atomic weight of $$Na$$.
$$\dfrac{Weight\ of\ Li + weight\ of\ K}{2}$$ =$$\dfrac{7+39}{2}$$ =$$\dfrac{46}{2}$$ =23
= weight of $$Na$$.
Hence, option B is correct.
Who is father of the Periodic Table of Elements?
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Johann Baeyer
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Dmitri Mendeleev
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Alfred Nobel
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Johannes Van der Waals
Explanation
Dmitri Mendeleev is known as father of periodic table of elements.
In a triad of $$A, B, C$$ elements, if the atomic masses of $$A$$ and $$C$$ respectively are $$100$$ and $$200$$, then the atomic mass of $$B$$ is:
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$$300$$
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$$175$$
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$$125$$
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$$150$$
Explanation
According to Dobereiner's law of traid, the average of the masses of the first and the last element is equal to the atomic mass of the middle element. So, $$\dfrac{100+200}{2}$$ = 150. Hence, the atomic mass of $$B$$ is 150.
Hence, the correct option is $$\text{D}$$
Which of the following is not a merit of Mendeleev's periodic table?
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It helped in correcting the atomic masses of some of the elements
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He predicted the properties of some undiscovered elements and left gaps for them
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He framed the periodic table with vertical and horizontal columns and gave shape to it
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He gave separate places to isotopes in his periodic table
Explanation
Merits of Mendeleev's periodic table:
1) It helped in correcting the atomic masses of some of the elements e.g. beryllium was corrected from 13.5 to 9. Similarly, indium, gold, platinum etc.
2) He predicted the properties of some undiscovered elements and left gaps for them e.g. Eka-boron, eka-aluminum and eka-silicon names were given for scandium, gallium, and germanium (not discovered at the time of Mendeleev).
3) He framed the periodic table with vertical and horizontal columns and gave shape to it.
4) Isotopes are the atoms of the same element having different atomic masses. Therefore, according to Mendeleev’s classification, these should be placed at different places depending upon their atomic masses. For example, hydrogen isotopes with atomic masses 1,2 and 3 should be placed at three places. However, isotopes have not been given separate places in the periodic table because of their similar properties.
Hence, option $$D$$ is correct.
Which of the following is arranged in order of increasing metallic character?
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$$P < Si < Na < Be < Mg$$
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$$Be < Mg < P < Na < Si$$
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$$Si < Be > Mg < Na < P$$
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$$P < Si < Be < Mg < Na$$
Explanation
Metallic character depends on the two factors:
Effective nuclear charge
Distance from the nucleus
On moving across the period effective nuclear charge increases and the tendency to lose electrons decreases. Down the group, effective nuclear charge decreases because outermost electrons are far away from the nucleus. Therefore electrons can be lost easily.
Hence, the metallic character increases down a group from top to bottom and decreases along a period as we move from left to right. $$Si$$ is a metalloid and $$P$$ is a non-metal. Hence, the order of increasing metallic character is:$$P < Si < Be < Mg < Na$$.
For which of the pair Newland octave rule is not applicable?
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$$Li,\ Na$$
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$$C,\ Si$$
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$$Mg,\ Ca$$
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$$Cl,\ Br$$
Explanation
According to Newland Octave law, when elements are arranged in increasing atomic mass every eighth element has similar properties to the first element.
Further, the law did not apply to elements of higher atomic masses. So, the law was applicable till calcium.
Hence, $$Cl, Br$$ does not apply to Newland Octave Rule.
In which state C can show tetra valency ?
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Ground state
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Transition state
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Excited state
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All the above
Explanation
The valency of carbon is four and in excited state it shows tetravalency which means it has tendency to form 4 bonds.
Hence, the correct option is $$C$$
Element with atomic number $$35$$ belongs to:
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$$3^{rd}$$ period
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$$18^{th}$$ group
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$$5^{th}$$ period
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$$17^{th}$$ group
Explanation
Element with atomic number $$35$$ is
Bromine
$$(Br)$$ and it belongs to group $$17$$ of the periodic table.
Mark the group which has maximum number of element in Mendeleev's periodic table:
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$$I$$
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$$II$$
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$$III$$
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$$IV$$
In order to fit elements into his table, newlands adjusted three elements in the same slot , but also put some unlike elements in the same slot.
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True
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False
Explanation
The given statement is True.
Newland adjusted three elements in the same slot but he also put some unlike elements in the same slot. For example, cobalt and nickel were in the same slot and these were placed in the same column as fluorine, chlorine and bromine which have very different properties than these elements. Iron, which resembles cobalt and nickel in properties, had been placed far away from these elements.
The most important active step in the development of periodic table was taken by
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Mendeleev
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Dalton
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Avogadro
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Cavendish
Explanation
The
most important active step in the development of periodic table was taken
by Mendeleev since though others have also made
significant
contributions towards classification of elements, he elevated the progress made in that direction much more than anyone else.
Hence Correct option is $$A$$.
For which element, the Law of Octaves was not found to be applicable?
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Oxygen
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Calcium
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Cobalt
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Potassium
In Mendeleev's Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later?
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Germanium
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Chlorine
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Oxygen
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Silicon Ana
Explanation
Mandeleev named the undiscovered elements as Eka-boron, Eka-aluminlum and Eka-silicon. These were replaced with scandium, gallium and germanium respectively in due course of time.
Doberiener's system of classification into triads was not found to be useful as he could identify only:
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Two triads
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Three triads
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Four triads
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Five triads
Explanation
He could only find 3 triads in elements due to this his concept was discarded.
Whose name is not associated with the development of periodic table?
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Prout's
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Newlands
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Rutherford
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Loother Meyer
Explanation
William Prout discovered that the atomic mass of an element can never differ. He observed that many elements have atomic weights as multiple of that of hydrogen.
Newland and Lowther Meyer also played a great role in the attempts to classify the elements.
However, Rutherford played a prominent role in explaining the structure of the atom.
Therefore, the correct option is C.
State whether the following statement is true or false:
It was assumed by Newlands that only 63 elements existed in nature and no more elements would be discovered in the future.
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True
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False
Explanation
The assumption in the statement is wrong because he assumed that only 56 elements existed in nature and no more elements would be discovered in the future.
Which one of the following does not increase while moving down the group of the periodic table?
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Atomic radius
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Metallic character
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Valency
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Number of shells in an element
Explanation
Valency of an element remains the same in a group.
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